Stir until the chocolate has melted, then cool till a coating consistency. Then pour the icing on to the centre of the cake. Spread it gently over the top and down the sides, and leave to set. For the icing writing, break the milk chocolate into pieces then melt gently in a bowl set over a pan of hot water. Roasting Squash Seeds. Spoon into a small paper icing bag or polythene bag and snip off the corner. Pipe Sacher across the top and leave to set. Make and share this Breakfast Strata recipe from Genius Kitchen. This chocolate cake is said to be invented in Vienna by the chef Franz Sacher in 1832. It improves if left a day or two before cutting. Mouthwatering, International menu of gourmet specialties. Inspired recipes for soups, salads and entres gathered from around the world.